| Poor clinical outcome mean (%) N = 12 | Good clinical outcome mean (%) N = 28 | Difference (%) | 95% CI of difference | p Value | |
| Diagnosis | <0.01 | ||||
| CHF | 8 (67) | 8 (29) | 38 | 4.9 to 61.7 | |
| COPD | 4 (33) | 5 (28) | 5 | −10.9 to 44.8 | |
| Stable chest pain | 0 (0) | 15 (54) | 54 | 23.5 to 70.5 | |
| Male gender | 8 (67) | 16 (57) | 10 | −22.6 to 36.1 | 0.73 |
| Age, years, mean (range) | 70 (56–82) | 69 (53–91) | 2 | −8.9 to 5.7 | 0.66 |
| Past medical history | |||||
| Coronary artery bypass graft | 7 (58) | 4 (14) | 44 | 12.6 to 68.0 | <0.01 |
| COPD | 4 (33) | 6 (21) | 12 | −14.7 to 41.7 | 0.45 |
| CHF | 8 (67) | 10 (36) | 31 | −2.3 to 55.6 | 0.09 |
| Previous myocardial infarction | 8 (67) | 10 (36) | 31 | −2.3 to 55.6 | 0.09 |
| Chest x ray findings | 0.03 | ||||
| CHF | 6 (50) | 6 (21) | 29 | −2.0 to 55.6 | |
| COPD | 3 (25) | 1 (4) | 21 | 0 to 49.8 | |
| Nil acute or normal | 2 (17) | 11 (39) | 22 | −9.6 to 44.5 | |
| ECG abnormal findings | 3 (25) | 5 (18) | 7 | −16.8 to 37.1 | 0.49 |
| Walk test results | |||||
| Completed | 7 (58) | 27 (96) | 38 | 11.7 to 64.6 | <0.01 |
| SaO2 <90% at 3 minutes | 3 (25) | 0 (0) | 25 | 4.9 to 53.2 | <0.01 |
CHF, congestive heart failure; COPD, chronic obstructive pulmonary disease; SaO2, arterial oxygen saturation.